{"id":6728,"date":"2026-01-23T16:52:14","date_gmt":"2026-01-23T21:52:14","guid":{"rendered":"https:\/\/blogs.mathworks.com\/videos\/?p=6728"},"modified":"2026-01-23T16:52:41","modified_gmt":"2026-01-23T21:52:41","slug":"debugging-string-concatenation-error-in-web-app","status":"publish","type":"post","link":"https:\/\/blogs.mathworks.com\/videos\/2026\/01\/23\/debugging-string-concatenation-error-in-web-app\/","title":{"rendered":"Debugging a String Concatenation Error in My Web App"},"content":{"rendered":"<p>My colleague found a bug in my MATLAB Web app. She could see a string concatenation error message in the app logs. I will go through the normal steps I would take to debug and fix such an issue in my apps.<\/p>\n<p>Features covered in this <a href=\"https:\/\/blogs.mathworks.com\/videos\/2015\/10\/29\/matlab-code-along-videos\/\">code-along<\/a> style video include:<\/p>\n<ul>\n<li>App Designer<\/li>\n<li>String concatenation<\/li>\n<\/ul>\n<p><div class=\"row\"><div class=\"col-xs-12 containing-block\"><div class=\"bc-outer-container add_margin_20\"><videoplayer><div class=\"video-js-container\"><video data-video-id=\"6388182359112\" data-video-category=\"blog\" data-autostart=\"false\" data-account=\"62009828001\" data-omniture-account=\"mathwgbl\" data-player=\"rJ9XCz2Sx\" data-embed=\"default\" id=\"mathworks-brightcove-player\" class=\"video-js\" controls><\/video><script src=\"\/\/players.brightcove.net\/62009828001\/rJ9XCz2Sx_default\/index.min.js\"><\/script><script>if (typeof(playerLoaded) === 'undefined') {var playerLoaded = false;}(function isVideojsDefined() {if (typeof(videojs) !== 'undefined') {videojs(\"mathworks-brightcove-player\").on('loadedmetadata', function() {playerLoaded = true;});} else {setTimeout(isVideojsDefined, 10);}})();<\/script><\/div><\/videoplayer><\/div><\/div><\/div><\/p>\n<p>Play the video in full screen mode for a better viewing experience.\u00a0<\/p>\n","protected":false},"excerpt":{"rendered":"<div class=\"thumbnail thumbnail_asset asset_overlay video\"><a href=\"https:\/\/blogs.mathworks.com\/videos\/2026\/01\/23\/debugging-string-concatenation-error-in-web-app\/?dir=autoplay\"><img decoding=\"async\" src=\"https:\/\/cf-images.us-east-1.prod.boltdns.net\/v1\/static\/62009828001\/178940d0-2ddf-4ff2-8aac-0ce99463b26a\/8eea1146-dfe2-45a7-aa59-efe6ef870a36\/1280x720\/match\/image.jpg\" onError=\"this.style.display ='none';\"\/><\/p>\n<div class=\"overlay_container\">\n      <span class=\"icon-video icon_color_null\"><time class=\"video_length\">13:26<\/time><\/span>\n      <\/div>\n<p>      <\/a><\/div>\n<p>My colleague found a bug in my MATLAB Web app. She could see a string concatenation error message in the app logs. I will go through the normal steps I would take to debug and fix such an issue in my&#8230; <a class=\"read-more\" href=\"https:\/\/blogs.mathworks.com\/videos\/2026\/01\/23\/debugging-string-concatenation-error-in-web-app\/\">read more >><\/a><\/p>\n","protected":false},"author":133,"featured_media":6730,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[33,27,4,36],"tags":[],"_links":{"self":[{"href":"https:\/\/blogs.mathworks.com\/videos\/wp-json\/wp\/v2\/posts\/6728"}],"collection":[{"href":"https:\/\/blogs.mathworks.com\/videos\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blogs.mathworks.com\/videos\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blogs.mathworks.com\/videos\/wp-json\/wp\/v2\/users\/133"}],"replies":[{"embeddable":true,"href":"https:\/\/blogs.mathworks.com\/videos\/wp-json\/wp\/v2\/comments?post=6728"}],"version-history":[{"count":3,"href":"https:\/\/blogs.mathworks.com\/videos\/wp-json\/wp\/v2\/posts\/6728\/revisions"}],"predecessor-version":[{"id":6732,"href":"https:\/\/blogs.mathworks.com\/videos\/wp-json\/wp\/v2\/posts\/6728\/revisions\/6732"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/blogs.mathworks.com\/videos\/wp-json\/wp\/v2\/media\/6730"}],"wp:attachment":[{"href":"https:\/\/blogs.mathworks.com\/videos\/wp-json\/wp\/v2\/media?parent=6728"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blogs.mathworks.com\/videos\/wp-json\/wp\/v2\/categories?post=6728"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blogs.mathworks.com\/videos\/wp-json\/wp\/v2\/tags?post=6728"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}